911PERVY

My drivers side centre vent is less than pssenger side centre..................right hand drive car though!

os993

interesting observation. If I close driver side center vent (use the rolling wheel thingee that closes the vent), it blows normally out of the passenger side center vent. When I open driver side center vent, passenger side center vent drops to almost nothing. So, middle ground solution is to open my driver side center vent 1/2 way open, and then both center vents work (but both a 1/2 output, is what it feels like).

It almost feels like some internal manual mechanism within the central vent area. Doesn't sound like Servo's (or does it)? Anything else that might be going on here?

996scott

my drives side vent has always blown harder than the passenger side on the center vents. I think it's normal.

techman1

Hmmm.
Tore?
I recall removing the center vent in the past, and there is no separate left and right ducting inside.
In other words, it is a single plenum attached to the vent. The left and right side join it further upstream.

My recollection from 8-10 years ago when I removed it.

Twilightblue28A

Your post supports that the center vents discharge equal velocity and equal temperature.

boomboomthump

You are correct. Not sure what folks are carrying on about here.

It's a single duct that feeds both center vents. The center vents are a single piece which inserts into the duct. There is nothing else going on in there. There is no "drivers side" or "passenger side" until the air hits the diverter flaps at the face of the vents which control the angle or open/closed.

os993

Fascinating! I mean it totally makes sense that's how it would be designed, but yet, when both middle vents fully open, the driver side is blowing 80-90% and the passenger side is 10-20%. Go figure! I'll stop chasing this because it sounds like a dead end, but it still baffles me.